OS 91 Surpass Engine Featured Engine: OS 91 Surpass

Four stroke engines tickle the fancy of many of us because they are simply “neat.” Their sound stirs the imagination, and they carry the airplane around the sky in a more realistic fashon. But they are expensive. A lot of money can be saved by buying used RC engines, if you can find a dependable used engine. I try to make all of my used engines relaible through repair, testing, and rating so you will know what you are getting before you buy.

BRAND SIZE RATING PRICE SKU DESCRIPTION
OS surpass 48 7- $85 28  
OS Surpass 48 6+ $75 13  
OS Surpass 91 7+ $170 175 Tested with a wood 14x6 prop and got 9,750 high and 1,740 idle. Transition and bearings good.
OS Surpass 91 7 $165 111 New bearings and new ring
OS surpass 91 9 $210 179 Bench run once for about 2 minutes.
OS Surpass 91 10 $230 145 A lot of shelf time, but is still perfect.
OS Surpass 91 10 $240 143 New in Box
OS Surpass 120 7 $190 202 Tested with 16x7 prop (16x6 would be better fit). Ran at 8,100 rpm and idled at 2,000. Bearings, transition, and compression good.
Saito 45 7- $85 26  
Saito 65 7 $140 19  
Saito 72 7 $150 177  
Saito 80 7 $150 159  
Saito 80 8- $180 156  
Saito 91 7+ $170 146 Tested in dark so not tach readings possible. High and idle rpms excellent as well as transition, compression and bearings. Impressive.
Saito 91 7+ $170 103  
Saito 91 8 $180 148  
Saito 100 7 $180 172  
Saito 100 7+ $190 167 Runs fantastically well. tested with a 14x8 prop and got 9,000 rpm on high and idled at 1,800 rpm.
Saito 100 8+ $220 201 Tested with a 14x6 prop.(15x6 better size) Ran at 9,900 and idled at 1,900 rpm. compression, transition, and bearings great. Impressive engine
Saito 120 7 $190 229 Tested with 16x8 prop. Ran at 7,400 rpm and idled at 1,700. Will get 1,000 rpm more with a 16x6 prop. Transition, compression and bearings good.
Saito 120 7 $195 228 Tested with 16x8 prop. Ran at 7,920 rpm and idled at 1,700. Will get 1,000 rpm more with a 16x6 prop. Transition, compression, and bearings good.
YS FZ 53 7 $135 4  
YS FZ 53 7+ $145 12  
YS FZ 90 7+ $180 8  
YS AC 110 8 $200 170  
YS FS 120 7 $200 10  
YS FS 120 7- $190 11  
YS SF 120 6+ $160 7  
YS SF 120 7- $180 6 muffler and 90 degree elbow header
YS SF 120 7 $210 244 Bulb muffler
YS SF 120 8 $215 246  
YS FS 120 7+ $210 239  
YS NC 120 7 $205 237 90 header plus a muffler